This is a two arm, participant-blinded, interventionist blinded, and research assessor-blinded RCT Participants with walking problems due to MS (Patient Determined Disease Steps PDDS 3-6) will be randomized 1:1 after baseline assessment stratified into 2 arms (lower walking disabilities PDDS 3+4, and higher walking disabilities PDDS 5+6) Following a 14 week balance and walking training intervention, participants will be instructed to continue to exercise independently according to the evidence-based Physical Activity Guidelines in MS for a subsequent 12 weeks. They will be reassessed at the end of that time (FOLLOW-UP).
